Originally Posted by MikeyMK

I considered an aluminium outer, with a steel core, as the alloy would gum-up the cutting wheel. But it'd still get through it.

My latest U lock is 19mm thick. That's thicker than a Kryptonite New York Fahgettaboutit.. It requires two cuts and is harder to pick for having dummy tumblers.

Yeah it's heavy, but barely heavier than my series-2 Kryptonite as it's shorter. And, you know, e-bike.. so it doesn't matter.